When the isotope bismuth-213 emits an alpha particle, what new element results?
A) lead
B) platinum
C) polonium
D) thallium
Answer: D
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An astronaut on a strange new planet finds that she can jump up to a maximum height of 27. meters when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration of gravity on the planet?
What will be an ideal response?
If the universe is closed, then its age will be
a. less than two-thirds of 1/H. b. more than two-thirds of 1/H. c. equal to 1/H. d. equal to H squared. e. equal to the square-root of H.
Other planetary systems are detected by a "wobbling" of the star as a consequence of ______________ effects of a planet
Fill in the blank(s) with correct word
Which kind of active galaxies has been observed at the greatest distances from us?
a. Seyfert galaxies b. radio galaxies c. quasars